Spectrum

Question 1

In visible light _________ deviated the most

Answer 1

violet colour

Question 2

which colour is deviated the least ______

Answer 2

red

Question 3

wavelength of violet _______

Answer 3

4000 A

Question 4

wavelength of red light ________

Answer 4

8000 A

Question 5

in glass speed of ________ is more

Answer 5

red

Question 6

in glass speed of __________ is least

Answer 6

violet

Question 7

prominent colour’s in white light -

Answer 7

VIBGYOR

Question 8

1 nm = ____m = ____A

Answer 8

1nm = 10^-9 m = 10 A

Question 9

1 A= ____ cm

Answer 9

10^-8

Question 10

which has longest wavelength in white light also lowest frequency

Answer 10

red

Question 11

which as shortest wavelength in white light or highest frequency

Answer 11

violet

Question 12

from violet end to red end _________ increases and ________ decreases

Answer 12

wavelength , frequency

Question 13

white light is _________ in nature

Answer 13

polychromatic

Question 14

dispersion

Answer 14

phenomenon of splitting of white light by a prism into constituent colour is known as dispersion

Question 15

Spectrum means

Answer 15

on passing white light into prism , the band of colour seen in screen is called spectrum

Question 16

deviation of light occurs at ______ surface of prism

Answer 16

both

Question 17

dispersion occurs only at _____surface

Answer 17

one

Question 18

what is invisible spectrum ?

Answer 18

the part of spectrum beyond the red and violet extreme

Question 19

the waves of wavelength longer than red light of visible spectrum

Answer 19

infrared radiation , microwaves ,radio waves

Question 20

waves of wavelength shorter than violet part of visible spectrum in decreasing order

Answer 20

ultra violet rays ,x rays ,gamma rays

Question 21

speed , frequency , wavelength is related as [formula]

Answer 21

c=f/lambda , lambda -wavelength

Question 22

gamma rays : wavelength nm-

Answer 22

below 0.01nm or 0.1 A

Question 23

gamma rays discovered by

Answer 23

becquerel and curie

Question 24

source of gamma rays

Answer 24

in cosmic rays from radio active substance

Question 25

uses of gamma rays -

Answer 25

they used to kill cancer cells and in industry to check welding

Question 26

properties of gamma rays -

Answer 26

cause fluorescence when they strike fluorescent materials [ zinc sulphide ] , penetrate through metallic sheet

Question 27

wavelength of x rays -

Answer 27

0.01 to 10 nm , 0.1 to 100 A

Question 28

properties of x rays

Answer 28

they affect photographic plate ,cause fluorescence when they strike fluorescent materials [ zinc sulphide ] , peneterate through human flesh but stopped by bone

Question 29

x rays discovered by -

Answer 29

roentgen

Question 30

source of x rays

Answer 30

from high melting target of heavy metal when highly energetic electrons are stopped by it

Question 31

wavelength of ultra violet rays also who found that

Answer 31

10 to 400 nm , 100 A to 4000 A , ritter [1801]

Question 32

ultraviolet rays source -

Answer 32

sun light , arc-lamp , spark

Question 33

on striking to ultra violet radiations silver chloride turns ________.

Answer 33

dark brown

Question 34

other name of ultraviolet radiations

Answer 34

actinic rays

Question 35

________ absorbs ultraviolet radiations

Answer 35

glass prism so its obtained on quartz prism

Question 36

why is ultraviolet bulbs have envelope made of quartz instead of glass

Answer 36

glass absorbs ultraviolet radiations

Question 37

_______ travels straight line in air [ speed of 3* 10^8

Answer 37

ultraviolet radiations

Question 38

properties of ultraviolet radiations

Answer 38

they scattered in atmosphere they affect photographic plate ,cause fluorescence when they strike fluorescent materials [ zinc sulphide ] they obey laws of reflection and refraction

Question 39

use of ultraviolet radiation

Answer 39

used for sterilising surgical equipment for detecting purity of eggs , ghee, germs for producing vitamin D harmful to human body as it creates skin cancer

Question 40

infrared rays - wavelength , discovered , source

Answer 40

800 to 10^6 nm | 8000 to 10^7 A, william hershell in 1800

Question 41

_______ used to detect heat radiation

Answer 41

thermopile

Question 42

_______ connected with thermopile shows deflection when infrared rays falls on thermopile

Answer 42

galvanometer

Question 43

which prism used for obtaining infrared radiation

Answer 43

rock-salt prism , glass absorbs it

Question 44

source of infrared

Answer 44

all red hot bodies

Question 45

properties of infrared rays

Answer 45

they travel in straight line at 3*10^8 in air or vacuum they don't affect ordinary photographic plate rock-salt prism , glass absorbs it not scattered much in earth atmosphere detected by blackened bulb or thermopile the green house gas absorbs low energy infrared radiation and keeps earth surface warm

Question 46

uses and harmful effect of infrared radiation

Answer 46

it used to take photo's at mist and fogy places it is used as lamp in dark room for developing photo's as it will not affect photographic plate it is used for sending signals during war used for therapeutic purpose they're used in remotes of tv and toys high dose may cause skin burn

Question 47

micro waves - wavelength

Answer 47

10^6 to 10^10 nm - 10^7 to 10^11 A

Question 48

micro waves discovered by

Answer 48

hertz

Question 49

micro waves uses and source

Answer 49

these waves are produced by crystal oscillators [electronic device ] used for satellite communication for cooking [ micro ovens ] radar communication analysis of atomic and molecular structure

Question 50

which wave has longest wavelength among all wave ?

Answer 50

Radio wave

Question 51

wavelength of Radio wave -

Answer 51

above 10^10 nm - 10^11 A

Question 52

radio waves found by

Answer 52

marconi

Question 53

radio wave uses and source

Answer 53

source in tv and radio transmission | mainly used in radar communication

Question 54

visible light affect photographic plate true/false ?

Answer 54

true